Michael Johnson, Robert D. Rosebrugh. Distributing Commas, and the Monad of Anchored Spans. In Alcino Cunha, Ekkart Kindler, editors, Proceedings of the 4th International Workshop on Bidirectional Transformations co-located with Software Technologies: Applications and Foundations, STAF 2015, L'Aquila, Italy, July 24, 2015. Volume 1396 of CEUR Workshop Proceedings, pages 31-42, CEUR-WS.org, 2015. [doi]